Pension Benefits - Narrative (Details)	1 Months Ended	3 Months Ended				12 Months Ended
	Jun. 30, 2019 USD ($) participant	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Percentage of eligible compensation (up to percent)						75.00%
Contribution expenses						$ 116,000,000	$ 102,000,000	$ 102,000,000
First Part Of Pay Contribution
Defined Benefit Plan Disclosure [Line Items]
Company match employee contributions (as a percent)						100.00%
Employee contributions (as a percent)						3.00%
Second Part Of Pay Contribution
Defined Benefit Plan Disclosure [Line Items]
Company match employee contributions (as a percent)						50.00%
Employee contributions (as a percent)						2.00%
Held-for-sale | German Wholesale Business
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities derecognized			$ 187,000,000
Accumulated other comprehensive loss derecognized			$ 33,000,000
Held-for-sale | Austrian Business Operations
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss derecognized		$ 11,000,000				$ 11,000,000
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Unexpected actuarial losses (as a percent) (exceeding)		10.00%				10.00%
Expected benefit payments in 2023		$ 34,000,000				$ 34,000,000
Expected benefit payments in 2024		33,000,000				33,000,000
Expected benefit payments in 2025		33,000,000				33,000,000
Expected benefit payments in 2026		34,000,000				34,000,000
Expected benefit payments in 2027		35,000,000				35,000,000
Expected benefit payments in 2028 through 2032		186,000,000				186,000,000
Expected contributions in next fiscal year		13,000,000				$ 13,000,000
Unit value of cash and cash equivalents (in dollars per share) | $ / shares						$ 1.00
Pension Plans, Defined Benefit | Held-for-sale | Austrian Business Operations
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities derecognized		43,000,000				$ 43,000,000
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation		56,000,000				56,000,000	64,000,000
Net periodic pension expense						0	0	0
U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Number of plan participants elected to receive settlement payments | participant	1,300
Settlements	$ 49,000,000					0	0
Pre-tax pension settlement charges				$ 105,000,000	$ 17,000,000			122,000,000
Annuity contracts purchased				$ 280,000,000
Accumulated other comprehensive loss								$ 0
Current assets		0				0	0
Current liabilities		$ 1,000,000				1,000,000	1,000,000
Actuarial gain (loss)						$ 0	$ 0
Discount rates		3.35%				3.35%	2.35%	3.08%
Actuarial loss						$ 0	$ 0	$ 129,000,000
Projected benefit obligation		$ 8,000,000				$ 8,000,000	$ 9,000,000	$ 10,000,000
Discount rates (percent)		3.35%				3.35%	2.35%	3.08%
Increase (decrease) in basis points						(0.0100)
Net periodic pension expense						$ 0	$ 0	$ 131,000,000
U.S. Plans | Pension Plans, Defined Benefit | German Wholesale Business
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss							33,000,000
U.S. Plans | Pension Plans, Defined Benefit | Unfunded plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation		$ 8,000,000				8,000,000	9,000,000
Non-U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Settlements						24,000,000	0
Current assets		49,000,000				49,000,000	0
Current liabilities		$ 90,000,000				90,000,000	9,000,000
Actuarial gain (loss)						55,000,000	(89,000,000)
Actuarial loss resulting from discount rate changes						$ 69,000,000	$ (32,000,000)
Discount rates		2.67%				2.67%	1.89%	2.03%
Actuarial gain (loss), demographic and assumption changes						$ (14,000,000)	$ (57,000,000)
Actuarial loss						14,000,000	35,000,000	$ 6,000,000
Projected benefit obligation		$ 701,000,000				$ 701,000,000	$ 875,000,000	$ 896,000,000
Discount rates (percent)		2.67%				2.67%	1.89%	2.03%
Increase (decrease) in basis points						(0.0078)
Amounts of plan exceeding total plan contribution						$ 20,000,000	$ 22,000,000	$ 17,000,000
Percentage of total plan contribution - exceeding (percent)						5.00%
Funded status (as a percent)		88.00%				88.00%
Amounts accrued for liability		$ 0				$ 0
Net periodic pension expense						4,000,000	19,000,000	19,000,000
Non-U.S. Plans | Pension Plans, Defined Benefit | Norwegian Public Service Pension Fund (SPK)
Defined Benefit Plan Disclosure [Line Items]
Amount of plan asset value		35,000,000				35,000,000	36,000,000
Non-U.S. Plans | Pension Plans, Defined Benefit | Unfunded plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation		$ 101,000,000				$ 101,000,000	$ 162,000,000
Termination of U.S Defined Benefit Pension Plan and Settlement of Retirement Benefits | U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss								$ 127,000,000